Washington: In his latest in a series of embarrassing gaffes, US President Joe Biden on Friday confused Gaza with Ukraine twice as he announced military aid airdrops in the besieged Palestinian enclave. Biden, whose mental health and old age have been under scrutiny lately, has sparked concerns that he is not fit to run for another term as the presidential elections approach.Washington: In his latest in a series of embarrassing gaffes, US President Joe Biden on Friday confused Gaza with Ukraine twice as he announced military aid airdrops in the besieged Palestinian enclave. Biden, whose mental health and old age have been under scrutiny lately, has sparked concerns that he is not fit to run for another term as the presidential elections approach.